Automatic sheet-feeding device



R. LEUMANN.

AUTOMATIC SHEET FEEDING DEVICE.

APPLICATION FILED MAR. 1| I92].

Patented Oct. 18, 1921.

2 SHEETS-SHEET I.

R. LEUMANN.

- AUTOMATIC SHEET FEEDING DEVICE.

APPLICATION FILED MAR. 1. 1921.

Patented Oct. 18, 1921.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

AUTOMATIC SHEET-FEEDING DEVICE.

Application filed March 1, 1921.

T 0 all whom it may concern:

Be it known that I, RICHARD LEUMANN, a citizen of the Republic of Switzerland, residing at Chailly-sur-Lausanne, Switzerland, have invented certain new and useful Improvements in Automatic $heet-Feeding Devices; and I do hereby declare the following to be a clear, full, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part'of this specification.

The present invention relates to improvements in automatic sheet-feeding devices which, for instance, are used in machines for wrapping sweetmeats.

If, for example, tin or aluminium foils, to which letters or the like are printed or stamped, are utilized for wrapping up sweetmeats, an intermediate leaf or separating sheet, for instance a sheet of tissue paper, is inserted between every two adjacent sheets or foils when the latter are arranged one above theother forming a pile, in order to prevent effacing the print on said foils.

The foils are lifted oil the pile when used for wrapping purposes and the intermediate sheets have to be removed as well. This latter function is effected by the object of the present invention.

According to the invention, which forms a device for removing separating sheets inserted between every two wrappers from a pile of sheets used in a machine for wrapping up sweetmeats and the like, two members are. provided adapted to engage the uppermost of the piled up sheets at'points that are at a certain distance from each other. Upon a relative movement of said two members toward each other,the intermediate or separating sheet which has been previously uncovered and which is lying on the topof the pile is acted upon by said two members so that the part of the sheet lying between the points of engagement bysaid members is bulged up or lopped and is thereby spitted to needles whereby the sheet may then be removed from the pile.

Specification of Letters Yatent.

Patented Oct. 18, 1921.

Serial No. 448,840.

A form of carrying the invention into effect is shown by way of example on the accompanying drawings, in which:

Figure 1 is an elevation, some parts being shown in section, of the device fitted to the table of a wrapping machine.

Fig. 2 is a plan view corresponding to Fig. 1.

Figs. 3, 4 and 5 illustrate in side views different operative positions of some parts of the device, other parts being left off.

Fig. 6 shows a detail of Fig. 3 on an enlarged scale.

In these drawings 1 denotes the elongation of the table of a wrapping machine which is not shown in the drawings. A lever 3 is pivotally mounted in a bearing 2 provided on said table, the lever 3 representing one of the above mentioned members of the device- The free end of the lever 3 is bent in a downward direction and a spring 1 tends to press the lever toward the table, i.e., in its normal position, which is shown in Fig. 1, the lever is pressed on the piled up wrappers a, between every two of which an intermediate or separating sheet 6 is inserted. The free end of the lever 3, which is arranged horizontally, is provided with two needles 3 to which the intermediate sheets to be removed are spitted. Further there are provided on said lever two limiting plate strips 5. 6 denotes an eccentric disk, a lever 8 pivotally mounted on a bolt 7 coacts by means of a roller 9 with the eccentric disk 6 and is oscillated by the latter. A tension spring 10 presses the roller 9 against the circumference of the eccentric disk 6. To the free end of the lever 8 there is pivotally connected at 11 an auxiliary lever 12 made for instance of aluminium, which auxiliary lever represents the second member of the device. A horizontal arm 13 provided at the free end oflever 12 is preferably fitted with a rubber covering; in the normal position illustrated in Fig. 1 the weight of the auxiliary lever causes the arm 13 to rest on the pile formed by the sheets a and b. The auxiliary lever 12 is provided with a counter weight 14 which can be shifted along a screw threaded rod 14: supporting the counter weight, by shifting the weight the pressure which the arm 13 of the lever 12 exerts on the pile of sheets can be regulated. A horizontal bar 16 adapted to be displaced in its longitudinal direction in guide means 15 is further provided, which bar is fitted with a roller 17 coacting with the lever 3. The movement of the bar 16 is derived from the movement of the GVFJQB' trio 6 by means of an oval groove provided in said disk, with which a roller 31 coacts, the movement of the roller being transmitted by links 32, 33, a double armed lever 34 and link to the bar 16. A plate 19 fixed to an axle 18 mounted in two bearings 18 (Fig. 2) is provided, which plate is normally held in the position shown in Fig. 1 by means of a tension spring 21 acting upon an arm 20 fixed to the axle 18, a set pin 22 (Fig. 2) is pressed against the table 1 by the pull of the spring 21 and secures the position of the plate 19. 23 denotes a set pin or stop screw which coacts with the elongazontal' direction toward the left whereby The operation of the above described device is as follows: Upon a rotary movement imparted to the eccentric disk 6 by a driving shaft 6 the'lever 8 is turned around the pivot 7 toward the left hand side into the position shown in Fig. 3. This turning movement of the lever 8 causes a displace ment of the auxiliary lever 12 in the horithe arm 13 of said lever causes the part of the uppermost intermediate sheet Z) with which it is infrictional engagement to follow said movement. On the other side ofthe arm 13 the sheet 5 isheld fast by the horizontal arm of the lever provided with the needles (Figs. and 6). This horizontal-displacement of the auxiliary lever 12 causes the portion of uppermost intermediate sheet '7). l ing between the points of engagement of the 1evers'12 and 3 to bulge out in the shape of a'loop, as is shown in Figs. 3 and 6, "and which loop is thrust upon the me dies 3 of the lever 3. The needles 3 are provided with barbed hooks. by which the;

sheet I) thrust 'on th'e needles is held fast on the lever 3. Then the part 12'of the auxiliary'lever' l2 abuts against the set screw 23 (Fig. 3) causing the lever to, be turned into the position illustrated in chain-dotted lines in Fig. 3 upon thefurthermovement of-the lever 8 around its pivot 7. Simultaneously the roller 17 engages the lever upon a displacement of the bar 16 in its guide 15, whereby the lever 3 is turned against the action of the spring l into the position illustrated in Fig. 4. By this turning movement the needles 3' enter the slots 19 of the plate 19 and the sheet 5 stuck fast or spittcd to the needles of the lever 3 is moved to the outer (left hand side) or the plate 19 (Fig. Thereupona roller 27 provided on the bar 16 abuts against the arm 20 of the plate '19 and causes the latter to be turned toward the left into the position shown in Fig. 5. By this turning movement the sheet Z) is drawn oli" the needles 3, tie, it is completely freed and can drop into a receptacle not shown in the drawing. In the meantime the sucker 28 of the wrapping machine has been moved in a downward direction (Fig. 4) and has sucked up. the uppermost wrapping sheet a (Fig. 5). which has been uncovered by the described removing of the intermediate sheet 6 and has delivered the sheet a. to the gripping tongues 29 operatively connected to the bar 16. Upon the return movement of'the bar 16, the wrapping sheet held by the tongue 29 is moved to its point of use in the'wrapping machine, while the plate 19 is turned back into its normal position by the action or" spring 21 and the'lever 3 returns to its normal position by the action of thespring 4 in the same degree as the bar 16returns into its initial position. The a'uxiliary'lever 12 returns to its initial position when the lever 8 returns. Thereis again a" separat ing sheet on the top of the pile, and the levers 3 and 12 rest on said sheet, and the above described operation is repeatedlv The parts of the wrapping machine which remove the wrapping sheets :such 'asthe tongue and the sucker areonly diagrammatically shown in the drawings, asthey do not form part'ott the invention. Their operation is knownas such and th'e'par'ts of the machine eliecting said operation are therefore not shown. 7 i

I claim: y

1. In a device for removing fromfa pile of sheets'used in wrapping machines sepa; rating sheets inserted between every two wrapping sheets, the combination of a first member adapted to engage every uppermost separatingsheet, the wrapping sheets being removedby members of the wrapping machine, sec'ondimember adaptedtoengage with saidfshee't ata point at some distance from the pointof engagement; of the first member, means to' move said. members relatively toand toward eachother so that no relative displacement between said mefmi bers and, the'sheet at the points of. engage.- I ment but a looping of the sheet is caused;-

and meansp'rovided on oneofsaid memberai t p t the sheet through said loop,

In a device for removing from a pile oi sheets used in wrapping machines separating sheets inserted between every two wrapping sheets, the combination of a table supporting a pile of sheets, a lever pivotally mounted on said table and adapted to engage every separating sheet lying uppermost on the pile of sheets, the wrapping sheets being removed by members of the wrapping machine, a member adapted to engage said sheet at a point at some distance from the point of engagement of said lever, means to move said member toward said lever and to cause thereby a looping of the part of the sheet between the two points of engagement, needles provided on said lever to which the looped part of said sheet is spitted and means to remove the sheet spitted to said needles.

3. In a device for removing from a pile of sheets used in wrapping machines separating sheets inserted between every two wrapping sheets, the combination of a table supporting a pile of sheets, a lever pivotally mounted on said table and adapted to be pressed against every separating sheet lying uppermost on the pile of sheets, the wrapping sheets being removed by members of the wrapping machine, a member adapted to frictionally engage said sheet at a point at some distance from the point of engagement of said lever. means to move said member toward said lever and to cause thereby a looping of the part of the sheet between the two points of engagement, needles provided on said lever to which the looped part of said sheet is spitted, means to cause a turning motion around its pivot of said lever and the sheet spitted to said needles, and means to engage with said lever on its turning motion for removing the sheet from said needles.

4. In a device for removing from a pile of sheets used in wrapping machines, separating sheets inserted between every two wrapping sheets, the combination of a table supporting a pile of sheets, a lever pivotally mounted on said table and normally adapted to be pressed against every separating sheet lying uppermost on the pile of sheets, the wrapping sheets being removed by members of the wrapping machine, a member adapted to frictionally engage said sheet at a point at some distance from the point of engagement of said lever, means to move said member toward said lever and to cause thereby a looping of the part of the sheet between the two points of engagement, needles provided on said lever to which the looped part of said sheet is spitted, a bar adapted to be displaced in guides provided on said table, an operative connection between said bar and said lever to cause a turning motion around the pivot of said lever together with the sheet spitted to said needles, and means porting a pile of sheets, a first lever pivotally mounted on said table and adapted to be normally pressed against every separating sheet lying uppermost on the pile of sheets, the wrapping sheets being removed by members of the wrapping machine, a second lever adapted to swing around a pivot, an aux iliary lever pivotally mounted on said second lever and adapted to frictionally engage said sheet at a point at some distance from the point of engagement of said first lever. means to move said auxiliary lever toward said first lever and to-cause thereby a loopi11 of the part of the sheet between the two points of engagement, needles provided on said first lever to which the looped part of said sheet is spitted, a bar adapted to be displaced in horizontal guides provided on said table, an operative connection between said bar and said first lever to cause a turning motion around its pivot of the latter together with the sheet spitted to said needles, and means to engage with said first lever on its turning motion and to be operated by the displaced bar for causing a removal of said sheet from said needles.

6. In a device for removing from a pile of sheets used in wrapping machines separating sheets inserted between every two wrapping sheets, the combination of a table supporting a pile of sheets, a first lever pivotally mounted on said table and adapted to be normally pressed against every separating sheet lying uppermost on the pile of sheets, the wrapping sheets being removed by members of the wrapping machine, a second lever pivotally mounted on said table, an auxiliary lever pivotally mounted on said second lever and adapted to frictionally engage said uppermost separating sheet at a point at some distance from the point of engagement of said first lever, a stop provided on said auxiliary lever, a stop screw fixed to said table, an eccentric disk operatively connected to said second lever for oscillating the latter whereby the auxiliary lever is first moved in a substantially horizontal direction toward said first lever and causes thereby a looping of the part of the sheet between the two points of engagement, whereupon said stop and stop screw coact and cause the auxiliary lever to be lifted off the sheet, needles provided on said first lever to which the looped part of said sheet is spitted, a bar adapted to be displaced in horizontal guides provided on said table, an operative connection between said bar and said first lever to cause a turning motion In testimony that I claim the foregoing as around the lever pivot of the latter together my invention, I have signed my name. with the sheet spitted to said needles, and RICHARD LEUMANN means to engage With said first lever on its turning motion and to be operated by the Witnesses:

displaced barfor causing a removal of said EUGENE FAVRE,

sheet from said needles. 1 ALFRED MAEDER. 

